Apparatus for marking knife-blanks.



E. A. OVERSTEDT.

APPARATUS FOR MARKING KNIFE BLANKS.

A APPLICATION FILED saw. 22, 1915.

1,191,989. Patnted July 25, 1916.

2 SHEETS-SHEET l- E. A. OVERSTEDT. APPARATUS FOR MARKINGKNIFE BLANKS.

APPLICATION HLED SEPT. 22, 1915- Patented July 25, 1916.

2 SHEETS-SHEET 2.

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ERNEST A. ovni srnnr, or BELOI'I', 'wiscoivsimassienon T0 0. nar'rrson iviiionin'r. WORKS, or BELOI'I', WISCONSIN, A CORPORATION or WISCONSIN.

nrPAnA'rUs ron MARKING KNIFE-BLANKS.

Patented July 25, 1916.

Application filed September 22, 1915. Serial No. 51,945.

To all whom it may concern I Be it known thatI, ERNEST A. Ovnns'rnnr, a citizen ofthe United States, residing at Beloit, in the countyof Bock 'and'State of Wisconsin, have made certain new and useful Improvements in Apparatus for lylarl ing Knife-Blanks, of which the following is a specification. I

The cutter-heads of I wood-turning and similar machines areequipped with knives set at an angle with relation to the axis of the cutter head. The cutting edges ofthe knives therefore are not of the same form as the coves, beads or other shapes to be .im-

parted to the work. Because of the inclined position of the knife, theedge of the knife is longer than the cove, head or other form produced by the knife. I y

In making cutter-knives, cut-and-try methods have heretofore been used, the blank being first ground to a rough approximation of the correct form, then rotated alongside a sample or pattern of the piece to be turned, then subjected to further grinding, again compared with the pattern, and so on until the required outline is imparted to the knife.

The object of this invention is to provide an apparatus whereby the outline required to produce the desired work may be quickly and accurately marked upon the knife blank, so that the proper conformation may be imparted to the blank at substantially a single grinding.

In the accompanying drawings, Figure 1 is a transverse vertical sectional view of an apparatus embodying the features of my invention, the view being taken inthe plane of dotted line,11 of Fig. 2. Fig. 2 is atop plan view of said apparatus. --Fig.- 3 is a view looking fromthe right-hand side of Fig. 1. Fig. I is a view of one of the end supports for the arbor of the machine. Fig. 5 is a perspective view of a marking device comprised in the apparatus.

The apparatus comprises'an arbor 1 upon which the cutter-head or sections of the cutter-head may be mounted. Said arbor is r0- tatably supported in three bearing brackets 2, 3, and 4. The bearing bracket 2 is detachably securedin position by meansofia bolt 5 in order that said bracket may be removed to permit of mounting and demounting the cutter-head.

While the apparatus may be used in connection' with cutter-heads of various forms,

I have herein shown a cutter-head comprising. a hexagonal body a having longitudinal T-slots b. To the body a are secured diametrically opposite knife carriers 0. The knives are secured to the knife carriers by means of bolts cl. Y

Means is provided for supporting a pattern P. at one side. of the arbor and extending parallel therewith. Said pattern may be of any suitable construction, as, for example, a thin strip ofhardwood having one edge shaped to correspond with the periphery of thework to be produced by the turning machine. The means for supporting the pattern P comprises, in this instance, two standards 6 and 7 having slots 8 to receive the ends of the pattern. The pattern is secured in place by means of thumb-screws 9. The pattern is held with its shaped edge at the sidetoward the cutter;

Below the-pattern P is means for supporting a marking device. IVhile said supporting means may be ofany suitable character, I have herein shown a guide bar 10 secured to the standards 6 and 7. On the guide bar 10 is movably mounted a slide 11 shown in perspective in Fig. 5. Said slide comprises top and bottom plates 12 which are adapted tofit slidably, but snugly, in contact with the upper and lower sides of the guide bar 10. The slide 11 is of such size as to permit it to slide and turn horizontally upon the guide bar 10, vertical movement, however, being impossible. Thus it will be seen that the slide is mounted so that it may turn in a plane parallel with the plane of the means of a set screw 16. The marker is axially alined with the tracer l3 and has a sharp point adapted to trace a line upon a knife blank secured to the cutter-head. In practice, the knife blank is coated with a suitable plastic material in which the marker 15 may trace a line indicating the form of the edge to be imparted to the knife. The

slide 11 may be provided with a handle of any suitable form for use in moving the tracer 13 along the edge of the pattern I Herein I have shown two angular brackets or handles 17 a In use, a pattern P is secured in the apparatus. A cutter-head section is then placed upon the arbor 1 opposite the part of the pattern which represents the form which the knife is to cut.

erator moves the slide 11 along the bar 10,

keeping thetracer 13 in contact with the edge of the pattern and turning the cutterhead so that'the point of the marker 15 may trace'a line on the surface of the blank The knife carrier 0 bearing the blank is then removed from the body a, and the blank ground to produce a cutting edge along the line traced by the marker.

For convenience, the blank-marking apparatus herein described may be provided with means for supporting another pattern P identical with the pattern P at the side of the arbor 1 opposite'to the pattern P. i

The ground blank may be attached to the body a and revolved past the pattern P for the purpose of determining whether or" not the grinding has been accurately done.

As the cutter-head is revolved at high speed in the turning machine, it isnecessary that the knives besecurely fastened to the knife carriers. In order that the operator may apply both hands to the wrench while tightening up the bolts (Z, I provide means to hold the arbor 1 stationary, which means consists 01" a pm 18 adapted to be placed in a transverse opening in the arbor, the end of the pin lying between lugs 19 on the bearing bracket 4. r

I claim as my invention: 1. An apparatus for marking knife blanks having, in combination, an arbor for rotatably supporting a cutter-head, means for supporting a pattern extending longitudinally of the arbor, a slidefsupported for movement longitudinally of the pattern and The knife blank having been coated with a plastic material, the op longitudinally of the guide means, a slide movable longitudinally of said guide means and adapted to turn in one plane only, a tracer on the slide adapted to follow the pattern, and a marker on the slide adapted to engage a knife blank on the cutter-head. 3. An apparatus for marking knife blanks having, in combination, an arbor for rotatably supporting a cutter-head, a guide member extending parallel with the arbor,

means for supporting a pattern extendinglongitudinally of the guide member, a slide movable along said guide member, a tracer on the slide adapted to follow the pattern,

and a marker axially alined with the tracer and fixed to the slide, said marker being adapted to engage a knife blankon the cutter-head. 1 i

1-. An apparatus for marking knife blanks having, in combination, means for rotatably supporting a cutter-head, a guide member extending parallel with the axis of the cutter-head, means for supporting a pattern extending longitudinally of the guide member, a slide movable along said guide member, a tracer on the slide adapted to follow the'pattern, and a marker on the slide adapted to'engage a knife blankon the cutter-head.

5. An apparatus for marking knife blanks having, in combination, means for rotatably supporting a cutter head, means forsupporting a pattern extending longitudinally of the axis of the cutter-head, a tracer movable along the pattern, and a marker fixed to the tracer and adapted to engage a knife blank on the cutter-head.

6. An apparatus for marking knife blanks having, in combination, means for rotatably supporting a eutterhead, means for supporting apattern, a tracer movable along the pattern, and a marker axially alined with and connectedto the tracer and adapted tlo engage a knife blank on the cutterheat.

'7. An apparatus for marking knife blanks having, in combination, means for rotatably supporting -a cutter-head, means for supporting a pattern, a tracer movable along the pattern, and a marker connected to the tracer and adapted to engagea knife blank on the cutter-head.

In testimony'whereof, I hereunto set my hand in the presence of two witnesses.

ERNEST A.-OVERSTEDT. In the presence of H. O. BROWN, C. A. FLOREY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D; 0. i 

